When you date a female of the Perley-Francis clan, you become caught in their trap, and therefore called the Perley-Francis Trap.

How it happens: You become very happy with them, and when you get to the peak of happiness, they knock you down, and make your life a living hell, and you can't escape the trap without losing some sort of your sanity.

Stranger 1:"What's wrong with him, she's such a bitch to him, but he keeps chasing her"